Alert archive / Florida / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 34, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 2, 2009, 10:54 PM EDT for Duval County, Nassau County, Florida; Camden County, Georgia. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 2, 2009, 10:54 PM EDT (02:54 UTC)
- Expired
- Apr 2, 2009, 11:45 PM EDT
- In force
- 51 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
Counties Duval County, FL, Nassau County, FL, Camden County, GA
The radar
The Jacksonville radar (KJAX), 15 km from the middle of the area, began a volume at 02:56 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 2, 9:47 PM EDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Jacksonville, FL (KJAX), launched 00:00Z, 2.9 hours before the alert went out and 14 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 316 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 527 m above ground
- 0-6 km bulk shear
- 93 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 379 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 2, 10:33 PM EDT, 21 minutes earlier.
Area forecast discussion, Apr 2, 10:33 PM EDT, 21 minutes before
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HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE JACKSONVILLE FL 1027 PM EDT THU APR 2 2009 FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-031000- HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY- ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE- JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY- INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN- COASTAL CAMDEN- 1027 PM EDT THU APR 2 2009 THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA. .DAY ONE...TONIGHT... ...TORNADO WATCH IN EFFECT UNTIL 5 AM FOR ALL OF NORTHEAST FLORIDA AND A PORTION OF SOUTHEAST GEORGIA... ...FLOOD WATCH IN EFFECT FOR ALL OF SOUTHEAST GEORGIA AND MOST OF NORTHEAST FLORIDA INCLUDING THE ADJACENT COASTAL WATERS THROUGH FRIDAY MORNING... ...AREAL FLOOD WARNINGS CONTINUE IN EFFECT FOR MUCH OF SOUTHEAST GEORGIA AND UPPER SUWANNEE VALLEY REGION OF NORTH FLORIDA... A TORNADO WATCH IS IN EFFECT FOR ALL OF NORTHEAST FLORIDA AND A PORTION OF SOUTHEAST GEORGIA THROUGH 5 AM FRIDAY. AN UPPER DISTURBANCE PRODUCING MORE STORMS IN THE NORTHEAST GULF ARE EXPECTED TO MOVE NORTHEAST ACROSS THE AREA TONIGHT. SOME STORMS MAY BECOME SEVERE WITH THE MAIN CONCERNS BEING ISOLATED TORNADOES...LARGE HAIL...AND DANGEROUS CLOUD TO GROUND LIGHTNING. A FLOOD WATCH CONTINUES FOR MOST OF THE FORECAST AREA. THERE HAVE BEEN NUMEROUS REPORTS OF FLOODED AND CLOSED ROADS IN SOUTHEAST GEORGIA AND THE SUWANNEE VALLEY REGION OF NORTH FLORIDA. ADDITIONAL RAINFALL AMOUNTS OF 2 INCHES ARE POSSIBLE IN ADDITION TO THE ESTIMATED 2 TO 4 INCHES THAT FELL EARLIER. THIS ADDITIONAL RAINFALL MAY CONTINUE TO CAUSE LOCALIZED FLOODING. MUCH OF SOUTHEAST GEORGIA AND THE UPPER SUWANNEE VALLEY REGION ARE UNDER AN AREAL FLOOD WARNING THROUGH EARLY FRIDAY MORNING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... ...FLOOD WARNINGS FOR VARIOUS RIVERS ACROSS SOUTHEAST GEORGIA AND NORTHEAST FLORIDA... RECENT HEAVY RAINFALL OVER PORTIONS OF SOUTHEAST GEORGIA WILL RESULT IN SIGNIFICANT RISES TO AREA RIVERS. FLOOD WARNINGS ARE IN EFFECT FOR THE ALAPAHA RIVER AT STATENVILLE...ALTAMAHA RIVER AT CHARLOTTE... SATILLA RIVER AT ATKINSON...ALTAMAHA RIVER AT BAXLEY...SATILLA RIVER AT WAYCROSS...ST MARYS RIVER AT MACCLENNY. REFER TO THE FLOOD STATEMENT THAT HAS BEEN ISSUED. ANOTHER COLD FRONT WILL APPROACH THE AREA BRINGING A CHANCE OF SHOWERS AND THUNDERSTORMS SUNDAY INTO EARLY MONDAY. STAY TUNED TO THE NATIONAL WEATHER SERVICE FOR UPDATED STATEMENTS AND POSSIBLE ADDITIONAL WARNINGS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED IN ALL AREAS UNDER THE TORNADO WATCH AND FLOOD WATCH. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX. PP
In the hours before
Special weather statement, Apr 2, 9:50 PM EDT, 1 hour 4 minutes before
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</html>Local storm report, Apr 2, 10:43 PM EDT, 11 minutes before
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</html>The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 8:14 PM EDT | Tornado Warning | JAX | Hamilton | 18 min |
| Apr 2, 8:15 PM EDT | Special Weather Statement | JAX | Nassau | 45 min |
| Apr 2, 8:15 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Hamilton, Suwannee | 60 min |
| Apr 2, 8:23 PM EDT | Severe Thunderstorm Warning | JAX | Duval, Nassau | 29 min |
| Apr 2, 8:40 PM EDT | Special Marine Warning | JAX | 2 hr | |
| Apr 2, 8:44 PM EDT | Severe Thunderstorm Warning | JAX | Clay, Duval, Nassau, Saint Johns | 46 min |
| Apr 2, 8:44 PM EDT | Tornado Warning | JAX | Columbia, Hamilton | 18 min |
| Apr 2, 8:56 PM EDT | Areal Flood Advisory | JAX | Baker, Clay, Columbia, Duval, Nassau, Union | 2 hr |
| Apr 2, 8:56 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Duval, Nassau | 49 min |
| Apr 2, 9:07 PM EDT | Special Weather Statement | JAX | Bradford, Union | 38 min |
| Apr 2, 9:15 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Hamilton, Suwannee | 45 min |
| Apr 2, 9:28 PM EDT | Severe Thunderstorm Warning | JAX | Bradford, Clay, Duval, Saint Johns | 47 min |
| Apr 2, 9:50 PM EDT | Special Weather Statement | JAX | Nassau | 55 min |
| Apr 2, 10:01 PM EDT | Areal Flood Advisory | JAX | Baker, Columbia, Nassau | 119 min |
| Apr 2, 10:08 PM EDT | Special Weather Statement | JAX | Nassau | 52 min |
| Apr 2, 10:29 PM EDT | Special Weather Statement | JAX | Columbia | 46 min |
| Apr 2, 10:58 PM EDT | Special Marine Warning | JAX | 2 hr | |
| Apr 2, 11:03 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Suwannee, Union | 42 min |
| Apr 2, 11:07 PM EDT | Special Weather Statement | JAX | Clay, Putnam | 38 min |
| Apr 2, 11:19 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Bradford, Clay, Duval, Union | 56 min |
| Apr 2, 11:42 PM EDT | Special Weather Statement | JAX | Duval | 48 min |
| Apr 2, 11:52 PM EDT | Special Weather Statement | JAX | Baker, Columbia, Suwannee | 38 min |
| Apr 3, 12:14 AM EDT | Severe Thunderstorm Warning | JAX | Suwannee | 46 min |
| Apr 3, 12:20 AM EDT | Severe Thunderstorm Warning | JAX | Duval | 40 min |
| Apr 3, 12:35 AM EDT | Areal Flood Warning | JAX | Clay, Duval, Nassau, Saint Johns | 9 hr |
| Apr 3, 12:46 AM EDT | Areal Flood Warning | JAX | Baker, Union | 9 hr |
| Apr 3, 12:54 AM EDT | Special Marine Warning | JAX | 2 hr | |
| Apr 3, 1:05 AM EDT | Special Weather Statement | JAX | Duval | 40 min |
| Apr 3, 2:14 AM EDT | Special Weather Statement | JAX | Duval | 46 min |
| Apr 3, 3:51 AM EDT | Special Weather Statement | JAX | Alachua, Bradford | 24 min |
| Apr 3, 4:12 AM EDT | Special Weather Statement | JAX | Clay | 33 min |
| Apr 3, 4:31 AM EDT | Special Weather Statement | JAX | Clay | 29 min |
| Apr 3, 4:35 AM EDT | Tornado Warning | JAX | Clay, Duval, Saint Johns | 25 min |
| Apr 3, 4:49 AM EDT | Special Weather Statement | JAX | Marion | 26 min |
| Apr 3, 4:58 AM EDT | Tornado Warning | JAX | Duval, Saint Johns | 32 min |
| Apr 3, 5:11 AM EDT | Special Weather Statement | JAX | Putnam | 64 min |
| Apr 3, 5:13 AM EDT | Special Marine Warning | JAX | 62 min | |
| Apr 3, 5:52 AM EDT | Special Weather Statement | JAX | Putnam | 38 min |
| Apr 3, 5:56 AM EDT | Tornado Warning | JAX | Flagler, Putnam, Saint Johns | 49 min |
| Apr 3, 6:21 AM EDT | Special Marine Warning | JAX | 54 min | |
| Apr 3, 6:27 AM EDT | Special Weather Statement | JAX | Marion | 33 min |
| Apr 3, 10:08 AM EDT | Areal Flood Warning | JAX | Baker, Columbia, Hamilton, Nassau, Suwannee, Union | 12 hr |
| Apr 3, 10:12 AM EDT | River Flood Warning | JAX | Columbia, Hamilton | 7 days |
| Apr 3, 5:26 PM EDT | Red Flag Warning | JAX | Baker, Bradford, Flagler, Nassau, Union | 3 hr |
| Apr 2, 8:39 PM EDT | Special Weather Statement | JAX | Brantley, Camden, Glynn, Wayne | 51 min |
| Apr 2, 8:46 PM EDT | Special Weather Statement | JAX | Brantley, Camden, Glynn, Wayne | 44 min |
| Apr 2, 10:20 PM EDT | Special Weather Statement | JAX | Brantley | 40 min |
| Apr 3, 1:14 AM EDT | Areal Flood Warning | JAX | Brantley, Pierce, Wayne | 9 hr |
| Apr 3, 10:23 AM EDT | River Flood Warning | JAX | Wayne | 11 days |
Nearby
Severe Thunderstorm Warnings in Florida, 2009Severe Thunderstorm Warnings in Georgia, 2009Every severe thunderstorm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.